Well, it's clear that the sounds are the issue, so why are they recommending the RCMC? Is this a new revenue stream, get you to replace working boards? Since this is a 2014 engine, I'd suspect the RS-Lite board may simply be bad. Of course, I'd be tempted to drop in the 16 ohm speaker first, since it's a whole lot cheaper. If it'll run for extended periods at a reduced volume, that might be the solution.
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